Many-Flowered Buckwheat (_Eriogonum multiflorum_) is also called umbrella-plant because of its spreading clusters at the top of the stem. It grows about 2 ft. high, being very abundant in sandy soil from South-central Texas to Arkansas and Louisiana in the late summer and fall. The name means “woolly knees,” referring to the jointed stems.
Buckwheat flour is made from the seeds of _Fagopyrum esculentum_, a closely related plant, similar in size, white-flowered, and with large 3-angled seeds. Queen’s crown or wreath (_Antigonon leptopus_), a lovely pink-flowered vine widely cultivated in Texas, is a member of the buckwheat family.
Annual Buckwheat (_Eriogonum annuum_), similar to the many-flowered buckwheat, but with leaves white-woolly on both sides and narrowed at the base, is very abundant in the northwestern part into New Mexico and Mexico. Acre after acre along the highways is often covered with it. Many other white-, yellow-, and red-flowered buckwheats are found in the mountains of West Texas.
Southern Smartweed (_Persicaria longistyla_), ranging from Mississippi to New Mexico is also called gander-grass or knotweed. It grows in wet places throughout the state and blooms in the late summer and fall. The dense spikes of small pink flowers are very attractive, the flowers having 5 pink sepals but no petals. The seeds are lens-shaped and covered with a black shining coat. The seeds of many of the smartweeds are considered good food for ducks.
Dotted Smartweed (_Persicaria punctata_) has scattered greenish-white flowers and 3-angled seeds. The leaves are much narrower than those of the Southern smartweed. Many other smartweeds are found in the state.
Curly-Leaved Dock (_Rumex crispus_), as well as several other docks, is common in the state. The leaves of some of them are used for greens. Canaigre is the dock of Western Texas and New Mexico, the roots of which have furnished tannin for commercial purposes.
[Illustration: SMALL-FLOWERED FOUR-O’CLOCK PINK FOUR-O’CLOCK]
Leaves opposite or alternate; flowers often surrounded by colored bracts; calyx tubular, often petal-like; petals absent; stamens 1 to many; ovary 1-celled.
Gray’s Umbrella-Wort. Pink Four-O’clock (_Allionia grayana_) has delicate pink flowers which have no petals, but the 5 united sepals are petal-like in appearance. The flowers are spreading or funnel-shaped and open in the afternoon. Several flowers are borne together and are surrounded at their bases by 5 short united floral leaves, forming a pale green veiny involucre which is sometimes mistaken for the flower. The clusters terminate the branches on a widely spreading plant about 2 ft. high.